Advanced intelligent single telephone number routing

ABSTRACT

An apparatus and method are provided for routing a telephone call according to the geographic location of the originating party. A subscriber with multiple network locations within a service territory may have all of their offices accessible to customers through a single publicized telephone number. The single telephone number may trigger advanced intelligent network technology. The network may ascertain the geographic location from which the call originates and accordingly, route the originating call to a subscriber&#39;s office which is located closest to the originating caller. Further, exception periods may be provided to enable subscribers to individualize their service by only routing to the closest satellite office at specified days, times, etc. The exception periods may also be employed to reroute calls intended for the closest satellite office to a predetermined location.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to an apparatus and method forrouting telephone calls in a telecommunications network according to thegeographic location from which the call originates. More particularly,the present invention relates to an application in an AdvancedIntelligent Network (AIN) for routing calls to a closest of a pluralityof branch or satellite offices based upon the geographic area in whichthe call originates, e.g., according to the zip code+4 of the caller.

2. Acronyms

The written description provided herein contains acronyms which refer tovarious communication services and system components. Although known,use of several of these acronyms is not strictly standardized in theart. For purposes of the written description herein, acronyms will bedefined as follows:

AIN--Advanced Intelligent Network

CCS--Common Channel Signaling

CENTREX--Central Exchange Service

CIC--Carrier Identification Code

CO--Central Office

CPR--Call Processing Record

DID--Direct Inward Dialing

DRS--Data Reporting System

ILEC--Independent Local Exchange Carrier

ISCP--Integrated Service Control Point

IXC--Interexchange Carrier

LATA--Local Access and Transport Area

LIDB--Line Information Data Base

LVAS--Line Validation Administration System

NPA--Number Plan Area

NXX--Central Office Code

PBX--Private Branch Exchange

PIC--Presubscribed Interexchange Carrier

SCP--Service Control Point

SS7--Signaling System 7

SSP--Service Switching Point

STP--Signaling Transfer Point

TCAP--Transaction Capabilities Applications Part

TCP/IP--Transmission Control Protocol/Internet Protocol

WAN--Wide Area Network

3. Background and Material Information

In recent years, a number of new telephone service features have beenprovided by an Advanced Intelligent Network (AIN). The AIN evolved outof a need to increase the capabilities of the telephone networkarchitecture to meet the growing needs of telephone customers. The AINarchitecture generally comprises two networks, a data messaging networkand a trunked communications network. The trunked communications networkhandles voice and data communications between dispersed networklocations, whereas the data messaging network is provided forcontrolling operations of the trunked communications network.

An illustration of the basic components of an AIN architecture is shownin FIG. 15. As shown in FIG. 15, Central Offices (CO) 64-70 are providedfor sending and receiving data messages from a Service Control Point(SCP) 56 via a Signaling Transfer Point (STP) 58-62. The data messagesare communicated to and from the COs 64-70 and the SCP 56 along a CommonChannel Signaling (CCS) network 88. Each CO 64-70 serves as a networkService Switching Point (SSP) to route telephone calls between a callingstation (e.g., station 72) and a called station (e.g., station 84)through the trunked communications network 90-92. For more informationregarding AIN, see Berman, Roger K., and Brewster, John H.,"Perspectives on the AIN Architecture," IEEE Communications Magazine,February 1992, pp. 27-32, the disclosure of which is expresslyincorporated herein by reference in its entirety.

A number of features provided by prior AIN or AIN-type intelligentnetworks relate to specialized call processing of incoming calls.

For example, U.S. Pat. Nos. 4,611,094 and 4,611,096, both to ASMUTH etal., disclose a system for providing custom incoming telephone callprocessing services to a subscriber operating at many geographicallydiverse locations. A subscriber program stored in a central database isaccessed to provide instructions to the SSPs to complete incoming callsto one of the subscriber locations in accordance with special servicesdefined by the subscriber. The subscriber program controls the ActionControl Points (ACP) to string together the desired call processingcapabilities to process each call. Specified parameters stored in theprogram, such as time of day, caller location and data inputted by thecaller, determine the final destination to which each call should becompleted.

U.S. Pat. No. 4,788,718, to McNABB, teaches centralized recording ofcall traffic information. The system provides a data gathering andrecording function to the centralized database which stores thesubscriber's call routing program. The subscriber's call routing programperforms several functions, including presenting various announcementsto callers, prompting callers for inputting information digits andcollecting the resulting information digits, routing the call to anumber provided by the subscriber, and performing final calldispositions other than routing to the telephone number provided by thesubscriber. Processing of the call traffic information dynamicallychanges the subscriber's call routing program to reduce the number ofblocked calls to the subscriber's telephone numbers.

U.S. Pat. No. 5,247,571, to KAY et al., discloses an Area Wide Centrexsystem to provide specialized calling features to stations connected toa plurality of central offices. Each of the central office switchingpoints connects to a number of local telephone lines. The features areextended to the local telephone lines by taking the programmingintelligence out of the central offices and moving it to a databaselocated at a centralized location, such as an SCP. Service features arecontrolled by the central database and are changed by reprogramming theservice logic located at the central database. A variety of servicefeatures are provided including a work at home service that enables auser of a private network access from a home telephone and accessauthorization to increase the security of the private network.

U.S. Pat. No. 5,353,331, to EMERY et al., discloses an AIN system whichconnects to, and controls processing of, calls to a subscriber'swireless handset via a home base station or wireless communicationnetwork. In response to calls directed to the subscriber's wirelesshandset, the AIN determines where the handset is located using a centraldatabase and routes the call to that location. The incoming call can berouted directly to the handset, blocked, or routed to an alternatetermination point. In response to calls from the handset, the centraldatabase provides instruction data to the land line network to extend arequested special service to the subscriber.

While prior AIN or AIN-type intelligent network applications haveprovided various call forwarding features to subscribers and users, suchprior attempts have not automatically ascertained the geographiclocation of the call origination so as to route the call to a nearesttermination telephone number as more fully described herein. Further,such prior attempts have not provided flexibility to subscribers interms of providing various routing options that may be combined withrouting based on geographic location of the call.

These features would be highly desirable to users or subscribers, i.e.,businesses with many satellite offices within a single geographic areaso that customers, by calling a single publicized telephone number, willautomatically be routed to the closest office location of thesubscriber. The ability to combine geographic routing with other routingoptions (time-of-day, day-of-week, specific date, percent allocationdistribution, etc.) would also be beneficial to businesses by providingproper and automatic routing of calls from customers. Further, by usinga single publicized telephone number, up-front investment costs of thesubscriber's premises equipment and advertising costs are reduced,customer's efforts to contact a convenient location of the subscriberare aided, and fast reliable service to subscribers and their customersis provided.

SUMMARY OF THE PRESENT INVENTION

In view of the above, the present invention, through one or more of itsvarious aspects and/or embodiments is thus presented to accomplish oneor more objectives and advantages, such as those noted below.

A general object of the present invention is to provide an apparatus andmethod for routing calls based upon the geographic location from whichthe call originates.

Another object of the present invention is to provide AdvancedIntelligent Network (AIN) functionality to a subscriber with multiplebranch or satellite business locations within a local telephone servicenetwork.

A further object of the present invention is to provide AdvancedIntelligent Network (AIN) functionality and routing for a singlepublicized telephone number.

Still another object of the present invention is to route calls to anearest branch office according to the geographic location of the callsorigination, e.g., by using zip code+4.

Another object of the present invention is to incorporate a singletelephone number service with other intelligent call forwarding servicesto route calls to a nearest satellite office according to a businesssubscriber's needs, e.g., the nearest branch open for business.

Accordingly, one aspect of the present invention is directed to a methodfor routing an originating call to a subscriber location within acommunication network. The network includes a two-way communicationnetwork interconnecting a plurality of service switching points and aplurality of dispersed network locations. The service switching pointsselectively establishing a communication connection between at least twoof the network locations in response to a call request from a callingparty, and a service control point includes a subscriber service logic.The network locations include a plurality of subscriber locations. Themethod includes identifying a subscriber's service based on the callrequest from the calling party to establish a communication connectionwith the subscriber, ascertaining a geographic location of theoriginating call in accordance with the originating telephone number ofthe calling party, determining which of the plurality of subscriberlocations is closest to the geographic location of the calling party,and routing the originating call to the determined closest subscriberlocation.

According to another aspect of the present invention, the ascertainingstep includes receiving the originating telephone number and translatingthe originating telephone number into a zip code of call origination.

According to yet another aspect of the present invention, theascertaining step includes forwarding the call request to apredetermined default telephone number when the originating telephonenumber is not received by the service control point.

According to a further aspect of the present invention, the methodfurther includes limiting incoming calls to the identified service tocalls originating within a predefined geographic area. The limiting stepmay occur after identifying the service and before the ascertainingstep.

According to yet another aspect of the present invention, the predefinedgeographic area defines a market area of the subscriber and stored in atable in the service control point.

According to another aspect of the present invention, the method furtherincludes forwarding calls originating outside of the predefinedgeographic area to an informational announcement.

According to another aspect of the present invention, the determiningstep includes comparing the ascertained geographic location with apredefined list of subscriber service areas. The predefined list may bestored within the service control point.

According to yet another aspect of the present invention, the predefinedlist correlates each geographic location within the subscriber servicearea with a predefined terminating number of one of the plurality ofsubscriber locations.

According to yet another aspect of the present invention, theascertaining step includes querying an external database that includes alist of service provider customer telephone numbers and correspondingcustomer geographic information. The customer information may includezip code+4 information.

According to another aspect of the present invention, the method furtherincludes responding to the querying step by transmitting the geographicinformation related to the originating telephone number to the servicecontrol point. The determining step forwards the call request to aterminating telephone number of the closest subscriber location to thegeographic location response.

According to another aspect of the present invention, the method furtherincludes responding to the querying step by transmitting predetermineddefault geographic information when the originating telephone number isnot listed in the external database. The determining step forwards thecall request to a predetermined default telephone number whenpredetermined default geographic information is transmitted in the queryresponse.

According to yet another aspect of the present invention, theascertaining step further includes waiting a predetermined time periodfor a response to the query to the external database and forwarding thecall request to a predetermined default routing telephone number if aresponse is not received within the predetermined period. Thepredetermined time period being between approximately 1.0 and 3.0seconds.

According to a further aspect of the present invention, the predefinedlist includes a plurality of geographic areas which comprise apredefined subscriber service area. Each geographic area listed isassociated with a routing telephone number corresponding to one of theplurality of subscriber locations. The determining step includescomparing the ascertained geographic location with each geographic arealisted in the predefined list. If one of the plurality of geographicareas corresponds to the ascertained geographic location, the methodforwards the call request to the associated routing telephone number,and if one of the plurality of geographic areas does not correspond tothe ascertained geographic location, the method forwards the callrequest to a predetermined default routing telephone number.

According to a further aspect of the present invention, each geographicarea is listed according to it post office zip code+4 designation. Thecomparing steps include comparing the ascertained geographic location tothe zip code+4 designation of each listed geographic area. If no matchesare found, comparing the ascertained geographic location to the zipcode+3 designation of each listed geographic area, wherein if no matchesare found, comparing the ascertained geographic location to the zipcode+2 designation of each listed geographic area, wherein if no matchesare found, comparing the ascertained geographic location to the zip code+1 designation of each listed geographic area, wherein if no matches arefound, comparing the ascertained geographic location to the zip code+0designation of each listed geographic area, and wherein if no matchesare found, the call request is forwarded to a predetermined defaultrouting telephone number.

According to another aspect of the present invention, each geographicarea may be listed only according to its zip code+2 and zip code+1designation.

According to yet another aspect of the present invention, the externaldatabase includes a line information database. The line informationdatabase includes receiving service provider customer billinginformation for each associated customer telephone number, stripping offpost office zip code +4 designations for each customer, and storing foreach customer zip code+4 designation according to the associatedcustomer telephone number.

According to another aspect of the present invention, the method furtherincludes recognizing an exception period for providing at least onealternate routing telephone number. When the exception period isrecognized before the ascertaining step, the method further includesforwarding the call request to at least one alternate routing telephonenumber. Each alternate routing telephone number may be assignedaccording to one of a time of day, a day of the week, or a specificdate. Each alternate routing telephone number may also be forwardedaccording to a predefined percent allocation distribution.

According to another aspect of the present invention, the exceptionperiod includes a plurality of exception periods, at least one exceptionperiod being associated with at least one routing telephone numberassociated with one of the plurality of subscriber locations. When oneof the exception period is associated with the determined closestsubscriber location, the method further includes forwarding the callrequest to at least one alternate routing telephone numbers. Eachalternate routing telephone number may be assigned according to one oftime of day, day of the week, specific date. Each alternate routingtelephone numbers may also be forwarded according to a predefinedpercent allocation distribution.

According to another aspect of the present invention, the exceptionperiod includes a first and a second exception period, the firstexception period being recognizable before the ascertaining step. Whenthe first exception period is recognized, the method further includesforwarding the call request to at least one alternate routing telephonenumber. The second exception period includes a plurality of exceptionperiods, at least one exception period being associated with at leastone routing telephone number associated with one of the plurality ofsubscriber locations. When one of the exception period is associatedwith the determined closest subscriber location, the method furtherincludes forwarding the call request to at least one alternate routingtelephone numbers.

According to yet another aspect of the present invention, each alternaterouting telephone number may be assigned according to one of a time ofday, a day of the week, or a specific date. Each alternate routingtelephone number may also be forwarded according to a predeterminedpercent allocation distribution.

Another aspect of the present invention is directed to an apparatus forrouting an originating call to a subscriber location within acommunications network. The network includes a two-way communicationnetwork interconnecting a plurality of service switching points and aplurality of dispersed network locations. The service switching pointsselectively establish a communication connection between at least two ofthe network locations in response to a call request from a callingparty, and a service control point includes subscriber service logic.The network includes a plurality of subscriber locations. The apparatusincludes a device for identifying a subscriber's service based on thecall request from the calling party to establish a communicationconnection with the subscriber, a device for ascertaining a geographiclocation of the originating call in accordance with the originatingtelephone number of the calling party, a device for determining which ofthe plurality of subscriber locations is closest to the geographiclocation of the calling party, and a device for routing the originatingcall to the determined closest subscriber location.

According to another aspect of the present invention, the ascertainingstep including means for receiving the originating telephone number andmeans for translating the originating telephone number into a zip codeof call origination.

According to another aspect of the present invention, the ascertainingmeans includes a device for forwarding the call request to apredetermined default telephone number when the originating telephonenumber is not received by the service control point.

According to another aspect of the present invention, the apparatusfurther includes a device for limiting incoming calls to the identifiedservice to calls originating within a predefined geographic area. Thelimiting device may be actuated after the service is identified andbefore the ascertaining device is actuated.

According to another aspect of the present invention, the predefinedgeographic area defining a market area of the subscriber and stored in atable in the service control point.

According to another aspect of the present invention, a device forforwarding calls originating outside of the predefined geographic areato an informational announcement.

According to another aspect of the present invention, the determiningdevice includes a device for comparing the ascertained geographiclocation with a predefined list of subscriber service areas, thepredefined list being stored within the service control point. Thepredefined list correlates each geographic location within thesubscriber service area with a predefined terminating number of one ofthe plurality of subscriber locations.

According to another aspect of the present invention, the ascertainingdevice includes a device for querying an external database that includesa list of service provider customer telephone numbers and correspondingcustomer geographic information.

According to another aspect of the present invention, the customerinformation including zip code+4 information.

According to another aspect of the present invention, the apparatusfurther comprising a device for responding to the querying step bytransmitting the geographic information related to the originatingtelephone number to the service control point.

According to another aspect of the present invention, the determiningdevice forwarding the call request to a terminating telephone number ofthe closest subscriber location to the geographic location response.

According to another aspect of the present invention, the apparatusfurther includes a device for responding to the querying step bytransmitting predetermined default geographic information when theoriginating telephone number is not listed in the external database.

According to another aspect of the present invention, the determiningdevice forwarding the call request to a predetermined default telephonenumber when predetermined default geographic information is transmittedin the query response.

According to another aspect of the present invention, the ascertainingdevice further includes a device for waiting a predetermined time periodfor a response to the query to the external database and a device forforwarding the call request to a predetermined default routing telephonenumber if a response is not received within the predetermined period.The predetermined time period being between approximately 1.0 and 3.0seconds.

According to another aspect of the present invention, the predefinedlist includes a plurality of geographic areas which comprise apredefined subscriber service area. Each geographic area listed isassociated with a routing telephone number corresponding to one of thesubscriber locations.

According to another aspect of the present invention, the determiningdevice includes a device for comparing the ascertained geographiclocation with each geographic area listed in the predefined list. If oneof the plurality of geographic areas corresponds to the ascertainedgeographic location, forwarding the call request to the associatedrouting telephone number and if one of the plurality of geographic areasdoes not correspond to the ascertained geographic location, forwardingthe call request to a predetermined default routing telephone number.

According to another aspect of the present invention, each geographicarea is listed according to it post office zip code+4 designation, andthe comparing device for comparing the ascertained geographic locationto the zip code+4 designation of each listed geographic area, wherein ifno matches are found, comparing the ascertained geographic location tothe zip code+3 designation of each listed geographic area, wherein if nomatches are found, comparing the ascertained geographic location to thezip code+2 designation of each listed geographic area, wherein if nomatches are found, comparing the ascertained geographic location to thezip code+1 designation of each listed geographic area, wherein if nomatches are found, comparing the ascertained geographic location to thezip code+0 designation of each listed geographic area, and wherein if nomatches are found, the call request is forwarded to a predetermineddefault routing telephone number.

According to another aspect of the present invention, the externaldatabase includes a line information database. The line informationdatabase includes a device for receiving service provider customerbilling information for each associated customer telephone number, adevice for stripping off post office zip code+4 designations for eachcustomer, and a device for storing for each customer zip code+4designation according to the associated customer telephone number.

According to another aspect of the present invention, the apparatusfurther includes a device for recognizing an exception period forproviding at least one alternate routing telephone number. When theexception period is recognized before actuation of the ascertaining adevice, the apparatus further includes a device for forwarding the callrequest to a one of the at least one alternate routing telephone number.Each of the at least one alternate routing telephone number is assignedaccording to one of time of day, day of the week, specific date. Each ofthe at least one alternate routing telephone number may be furtherforwarded according to percent allocation distribution.

According to another aspect of the present invention, the exceptionperiod includes a plurality of exception periods, at least one exceptionperiod being associated with at least one routing telephone numberassociated with one of the plurality of subscriber locations. When oneof the exception period is associated with the determined closestsubscriber location, the apparatus further includes a device forforwarding the call request to a one of the at least one alternaterouting telephone numbers. Each of the at least one alternate routingtelephone number is assigned according to one of time of day, day of theweek, specific date. Each of the at least one alternate routingtelephone numbers may be further forwarded according to percentallocation distribution.

According to another aspect of the present invention, the exceptionperiod includes a first and a second exception period, the firstexception period being recognizable before the ascertaining step. Whenthe first exception period is recognized, the apparatus further includesa device for forwarding the call request to a one of the at least onealternate routing telephone number. The second exception period includesa plurality of exception periods, at least one exception period beingassociated with at least one routing telephone number associated withone of the plurality of subscriber locations. When one of the exceptionperiod is associated with the determined closest subscriber location,the apparatus further includes a device for forwarding the call requestto a one of the at least one alternate routing telephone numbers. Eachof the at least one alternate routing telephone number is assignedaccording to one of time of day, day of the week, specific date. Each ofthe at least one alternate routing telephone number may be furtherforwarded according to percent allocation distribution.

Another aspect of the present invention is directed to an apparatus forrouting an originating call to a subscriber location within acommunications network. The network includes a two-way communicationnetwork interconnecting a plurality of service switching points and aplurality of dispersed network locations. The service switching pointsselectively establishing a communication connection between at least twoof the network locations in response to a call request from a callingparty, and a service control point includes subscriber service logic.The network includes a plurality of subscriber locations. The apparatusincludes a device for accessing a subscriber's service logic associatedwith a subscriber's service from a telephone number input by the callingparty, a device for transmitting a query to a database to determine azip code associated with the calling party, a device for receiving aresponse from the database, the response including an associated zipcode, a predefined look up table for associating each zip code within asubscriber service area with one of a predefined terminating telephonenumber and a default terminating number, the terminating telephonenumber associated with a subscriber location predefined to receive callsoriginating within the associated zip code, a device for looking up thereceived response from the database to determine the terminating number,and a device for routing the originating call to the determinedterminating number.

According to another aspect of the present invention, the apparatusfurther includes a forwarding device for bypassing the subscriber'sservice during one of a predetermined day of the week, time of day, andspecific date. The forwarding device includes a device for routing theoriginating call to an alternate routing number associated with theforwarding a device.

According to another aspect of the present invention, the apparatusfurther includes a forwarding device for rerouting the originating callfrom the determined terminating number to an alternate routing numberduring one of a predetermined day of the week time of day, and specificdate.

According to another aspect of the present invention, the apparatusfurther includes an error detection device for detecting at least onepredetermined error occurring during the call request.

According to yet another aspect of the present invention, the errordetection device includes a recording and compiling device for recordingthe at least one predetermined error occurring during the call requestand for compiling the at least one predetermined error in a predefinedformat.

According to a further aspect of the present invention, the at least onepredetermined error includes at least one of no originating numberdelivered to the subscriber's service logic, the originating number notfound in the database, the originating number found in the databasewithout a corresponding zip code, the zip code not found in thepredefined look-up table, timeout, query error to database, responseerror from database, the originating number not originating from aparticipating carrier, and originating call from outside of thepredefined subscriber locations.

The above-listed and other objects, features and advantages of thepresent invention will be more fully set forth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described in the detailed descriptionthat follows, by reference to the noted plurality of drawings by way ofnon-limiting examples of preferred embodiments of the present invention,in which like references numerals represent similar parts throughout theseveral views of the drawings, and wherein:

FIG. 1 illustrates, in a general block diagram form, an AdvancedIntelligent Network (AIN) system for implementing intelligent singletelephone number routing features according to an aspect of the presentinvention;

FIG. 2 shows an exemplary representation of a local service area of asubscriber;

FIG. 3 shows an exemplary table for defining a subscriber's service areaby correlating local zip codes with satellite office routing telephonenumbers;

FIG. 4 shows an exemplary table for use with a Market Area Screeningservice of the invention;

FIG. 5 is an example of a flow diagram for a zip code CPR forimplementing the features of the invention;

FIG. 6 shows an exemplary NPA-NXX table for determining whether acaller's NPA-NXX is supported by the external database;

FIG. 7 shows an example of a flow diagram of a trigger CPR and logicflow for a single telephone number zip code routing service, accordingto the present invention;

FIG. 8 shows an example LATA table that may be stored within the ISCP;

FIG. 9 shows an example of a flow diagram of a trigger CPR and logicflow for a single number service;

FIG. 10 shows an example of a single number service service, accordingto the present invention;

FIG. 11 shows an example of a flow diagram of a trigger CPR for acustomer location routing service of the present invention;

FIG. 12 shows an example of a customer location routing service service;

FIG. 13 shows an example of a flow diagram of a trigger CPR and logicflow for a single number/customer location routing service;

FIG. 14 shows an example of a single number/customer location routingservice service, according to the present invention; and

FIG. 15 shows an AIN system, according to the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Many telephone services may be provided using an AIN or AIN-type networkfor centralized control of telephone services offered to subscribers, asopposed to localized control of services at the Central Office (CO). TheAIN system is provided through interaction between switching points andother systems supporting AIN logic.

The AIN based single telephone number routing service of the presentinvention may be implemented using at least AIN Release 0.1 and 0.0protocols, software and hardware for the line information data base(LIDB), and other AIN capabilities, including programmable servicecontrol points (SCPs), central offices equipped with AIN serviceswitching point (SSP) features, and existing Common Channel Signaling(CCS) networks. The Signaling System 7 (SS7) network is a widely usedCCS network that provides two-way communication of TransactionCapabilities Application Part (TCAP) formatted data messages between theSCP and the SSP. The AIN based system essentially employs an upper-levelsoftware network through the SSPs and the SCP. The upper-level softwareresides over the service hardware to check the call route and theavailability of connection prior to hardware connection.

Although the various embodiments of the invention described herein makereference to particular AIN implemented features and structures, otherAIN and AIN type architectures and components may be used to provide andimplement the present invention.

Referring now to the accompanying drawings, FIG. 1 illustrates a generalblock diagram of an Advanced Intelligent Network (AIN) in which anapparatus and method for intelligent single telephone number routing isembodied in accordance with an aspect of the present invention. In FIG.1, local telephone lines 5 connect a plurality of individual networklocations 34A-48B in each geographic area to the closest Central Office(CO), or End Office (EO) 34-48.

End Offices 34-48 are equipped as AIN SSPs to allow normal switch callprocessing to be suspended at specific points in a telephone call,enabling TCAP formatted query and response messages to be transmittedbetween the SSP and ISCP. AIN queries will be routed from a centraloffice or switching service point to a local STP using existing SS7links. These queries will then be routed from the local STP to theregional STP, and from the regional STP to the ISCP. The SS7 messagerouting should be devised to minimize the need for data administrationat the local and regional STPS. A capability code may be established atthe STPs that serve the SCP. This capability code is used by the SSPsand the STPs to do point code routing until the message is received bythe "last" STP pair (that is, serving the SCP). STPs within the networkare equipped to route AIN SS7 messages from SSPs to ISCPs based upon sixdigit global title translations. For example, NPA-NXX of the singletelephone number may be translated by the STP to destination point code(DPC) of ISCP running the single telephone number application for thatsingle number.

The SSPs may include, but are not limited to, 5ESS, 1AESS, and DMS-100switches. The trigger on the 5ESS switch may be an AIN type 10 digittrigger. The trigger may be based upon AIN Release 0.1 protocol andpreferably AIN Release 0.1 query call variables may be converted intocommon call variables by a call processing record (CPR) in ISCP 30. If a5ESS switch is utilized, then these switches should be equipped withGeneric 5E9(1) (or higher) and provided the necessary triggerrequirements (discussed below) in order to serve subscribers. Thetrigger on a 1AESS switch may be a dialed line number trigger based upona 10 digit virtual number. The trigger may be based upon the AIN Release0.0 protocol and preferably AIN Release 0.0 query call variables may beconverted into common call variables by a CPR in the ISCP. Further, if1AESS switches are employed, they should be equipped with Generic1AE12.03 (or higher) and provided the necessary trigger requirements inorder to serve subscribers. The trigger on the DMS-100 switch may be atermination attempt trigger (TAT) based upon the AIN Release 0.1protocol and preferably AIN Release 0.1 query call variables may beconverted into common call variables by a CPR in the ISCP 30. Further,if DMS-100 switches are used, NA003, Release 2 (or higher) should beprovided.

Triggers in switches may have certain identifiable parameters, includingthe telephone number with the trigger that permit the SSP and ISCP tosynchronize their mutually supporting activities. On its end, the ISCPuses the trigger identifiable parameters to select the proper CPR toimplement the technique of converting the call variables that accompanythe query with trigger identifiable parameters into common callvariables.

For purposes of illustration, six SSPs are shown in FIG. 1. The actualnetwork may be provisioned with more (or less) than the number of SSPsshown in FIG. 1. The SSPs 34-48 are switches which perform the followingfunction: recognize AIN-type calls; launch queries to an IntegratedService Control Point (ISCP) 30; and, receive commands and data from theISCP 30 to further process and route AIN-type calls. When one of theSSPs 34-48 is triggered by an AIN-type call, the SSP formulates an AINservice request and responds to call processing instructions from thenetwork element in which the AIN service logic resides. The AIN servicelogic or control software may reside in a database at the ServiceControl Point (SCP) 26. The SSPs are connected by trunked communicationlines 52 which are used to connect and carry communication signals,e.g., voice and/or data, from a calling party to a called party.

In FIG. 1, the SSPs are shown equipped with Common Channel Signaling(CCS) capabilities, e.g., Signaling System 7 (SS7), which provides fortwo-way communications of data messages between each SSP and the ISCP 30via CCS links 50. The data messages are formatted in accordance with theTransaction Capabilities Applications Part (TCAP). As shown in FIG. 1,each SSP 34 and 36 may be connected to a first local area SignalingTransfer Point (STP) 20 by SS7 link 50; each SSP 38 and 40 may beconnected by SS7 link 50 to STP 21; and each SSP 46 and 48 may beconnected by SS7 link 50 to STP 22. The connections by links 50 to theSTPs are for signaling purposes, and allow the SSPs to send and receivemessages to and from the ISCP 30 via the STPs. Each of the STPs can beconnected to a large number of other STPs. For purposes of illustrationin FIG. 1, SS7 links 50 are shown as connecting local STPs 20, 21, and22 to a regional STP 24 and connecting the regional STP 24 to the ISCP30.

The ISCP 30 is an integrated system which may include a ServiceManagement System (SMS) 27, a Data and Reports System (DRS) 28, aprogrammable Service Control Point (SCP) 26, and a Service CreationEnvironment (SCE) 32. The SCE 32 is a software based terminal that maybe implemented to work with the SMS 27 to create, modify, and loadservice control software (i.e., service logic) into the database in theSCP 26. The SCP 26 executes software-based service logic and may returncall routing instructions to the SSPs. The SMS 27 and the DRS 28 may beprovided for compiling calling information to be used for billing andadministrative purposes. By way of example, the ISCP 30 may beimplemented with the Bellcore Integrated Service Control Point (ISCP),loaded with preferably at least ISCP software Version 4.0, availablefrom Bell Communications Research, Inc., of Livingston, N.J.

The SCP 26 may be linked to an external database 150 that stores variousrouting information, e.g., information for translating an originatingtelephone number into the caller's geographic location of origin. Theexternal database 150 may be linked to STP 24 via data communicationlinks and include, e.g., a line information database (LIDB) runningpreferably at least software Version LIDB 7.0, available from BellCommunications Research, Inc., of Livingston, N.J. Alternatively,external database 150 may be directly accessed by and connected to SCP26 via a TCP/IP connection (not shown)

Advanced Intelligent Network (AIN) call processing differs from standardtelephone call processing in that a query to a centralized database,e.g., ISCP 30, is triggered by an AIN application. In AIN-type callprocessing, an SSP is responsible for identifying calls associated withAIN services, detecting when conditions for AIN service involvement aremet, formulating service requests for call processing instructions, andresponding to the instructions received. As with normal call processing,the call may be suspended at the calling party's end office or switchequipped as an SSP and may send a data message, via the SS7 links 50, tothe STPs to establish the call route. AIN services are created byassigning appropriate SSP call suspension points, known as AIN"triggers", accessed via customer lines or telephone numbers, andaccessing customer or service-specific logic in the ISCP 30.

The SSPs launching the AIN queries are preferably end office AIN SSPs,34-48. This enables the trigger for the subscriber service to be placedat the end office serving the NPA-NXX of the single telephone numbertrigger and allows the trigger to use trunks 52 or other facilities,i.e., inter-LATA, international, etc., for call routing. Thus, if anoriginating call encounters an AIN trigger at the end office designatedto receive the NPA-NXX of the single telephone number trigger, i.e.,triggering AIN service involvement, the SSP, e.g., 36, suspends callprocessing, then queries the ISCP 30 through the STPs 20 and 24 over theSS7 links 50.

For purposes of illustration, assume that a business (Business X), e.g.,a food delivery service, has a main office at location 36B, foursatellite (branch) offices located throughout the local telephoneservice area at locations 38B, 40B, 46B, and 48B, and subscribes to theintelligent single telephone number zip code routing service. Assumethat Business X advertises its single telephone number, e.g., 987-6543,which is a telephone number (i.e., NPA-NXX) served from end office 40.Also assume that a customer (customer Y) at location 34A desires food tobe delivered from Business X. Customer Y picks up the receiver at 34Aand gets a dial tone from end office/SSP 34, Customer Y may dial thesingle telephone number publicized by Business X, e.g., 987-6543, fromoriginating location 34A, ultimately offering connection to the nearestdelivery office of Business X, e.g., Main Office at location 36B. TheAIN trigger may be established in the SSP end office that serves the NXXof the single telephone number, i.e., end office 40; however, the systemshould not be construed as limited to this arrangement, for example, theAIN trigger could be established at the originating end office that isequipped as an SSP or at a local or LATA tandem switch equipped as anSSP. In FIG. 1, end office/SSP 34 routes the call over trunks 52 to endoffice/SSP 40. End office/SSP 40 then receives the call and istriggered. As a result, end office/SSP 40 launches a message, over links50, to query SCP 26. SCP 26 then responds back to end office/SSP 40 withrouting information, and end office/SSP 40 routes the call over trunks52 to end office/SSP 36. End office/SSP 36 rings location 36B, andBusiness X at location 36B may answer to complete the communicationpath.

Upon receiving the query message from the AIN SSP equipped end office40, the ISCP 30 executes software based service logic programs stored inthe SCP 26 to perform subscriber functions, e.g., establishing a routingnumber based upon the geographic location of the originating party, andreturns a response to the end office 40 with call routing instructionsto forward the call to the appropriate location (e.g., location 36B).The AIN service application, e.g., CPR 10, may be stored in an ISCPdatabase, e.g., the SCP 26, and accessed by a predetermined SSP querylaunched from the triggering location, e.g., location 40.

As noted above, new services may be created by assigning appropriate SSPAIN triggers to subscriber lines or telephone numbers to accesssubscriber and/or service-specific logic in the ISCP. The intelligentsingle telephone number zip code routing service features of the presentinvention may be provisioned via SSP triggers implemented with the 10digit part of the 3/6/10 digit trigger in AIN Release 0.1 for 5ESSswitches, the Terminating Attempt Trigger (TAT) in AIN Release 0.1 forDMS-100 switches, or the office based (DN) trigger in AIN Release 0.0for 1AESS switches.

When the ISCP 30 receives a query, the advanced intelligent singletelephone number zip code routing service logic will be executed. Calldata may be collected and recorded in the DRS 28, as per the normal ISCPSAMPLE node operation. For example, the ISCP 30 may contain residentservice software that collects the calling (originating) telephonenumber, and called (terminating) telephone number. This resident servicesoftware may also collect the date and the time of certain predeterminederror conditions that may arise during each query to the ISCP 30. A callprocessing record 10 may also be provided that is stored within the SCP26. The CPR 10 may contain the service logic for each trigger, zip codetranslation, and call routing. The features of the CPR 10 are more fullydiscussed below with reference to FIGS. 5, 7, 9, 11, and 13.

After the ISCP 30 has collected the call data, the ISCP 30 will thenreturn control of the call, via a routing number, to the call suspendingSSP for termination. The routing number for this service will generallybe the telephone number of the closest satellite office of thesubscriber to the originating party's geographic location.

Once the subscribed service logic has been completed, control of theoriginating call may be returned to the triggering SSP. To complete theoriginating phone call, the ISCP service logic for this service mayrespond to the SSP query in one of two possible responses. The servicemay respond with a routing number in a TCAP connect message to thetriggering SSP or respond with a message to play an announcement to thecaller, e.g., to indicate that the caller is not within the subscriber'sservice area.

SINGLE TELEPHONE NUMBER ROUTING

As noted above, the single telephone number zip code routing feature isa geographic routing service that may be used for by businesssubscribers doing business from or providing services from more than onelocal area office. For example, as shown in FIG. 2, a portion of localtelephone service area is shown which includes zip codes 63101 and63102, each zip code further divided with a zip code+4 designation.Assume that Business X has its main office at 36B and 4 branch orsatellite offices dispersed throughout the local area at locations 38B,40B, 46B, and 48B. Business X subscribes to the single telephone numberzip code routing service so that caller's within Business X's servicearea may call one telephone number and be automatically connected withthe nearest Business X office.

To initiate service, business subscribers must predefine the servicearea from which calls are to be routed. For example, the business maydefine a service area according to a 5 to 9 digit zip code, 9 digitsbeing more specific and preferred. Telephone calls offered to the singletelephone number zip code service will be translated to determine the 5to 9 digit zip code of the caller and identify which branch office ofthe subscriber to route the call based on the caller's zip code.

FIG. 3 shows one example of predefining the service area. The servicearea information may be provided in a look-up table that is stored inSCP 26. The service information may be provided in various layouts,e.g., 10 digit telephone number fields, zip code fields, and otherfields. In FIG. 3, the first column defines the zip code of theoriginating (or calling) party. The second column of FIG. 3 defines therouting number for calls originating from the corresponding zip code.According to the example of FIG. 3, Business X has defined the areacodes 63101 and 63102 as the general service area. Any calls originatingfrom the nine digit zip code 63101-1234 will be routed to (314)380-8500.It is noted that the nine digit zip code is not required for predefininga service area, i.e., the service area may be predefined by any lengthzip code between five to nine digits. Thus, where the satellite officesare less densely populated, the service area may be defined by, e.g.,seven digits (zip code+2) (see, e.g., row 3 of FIG. 3). The initialservice information should also include a single telephone number (i.e.,the number that "triggers" AIN processing at the SSP), a carrieridentification code for any inter-LATA routing telephone number, adefault routing telephone number, and an enable/disable for a marketarea screening option. The default telephone number is important in thatany calls that cannot be routed according to the caller's geographiclocation are automatically routed to the subscriber's predefined defaultlocation for handling such matters. If the market area option has alsobeen selected, the market area, defined by NPA-NXXs, must also beincluded to designate the areas from which calls will be allowed.

While the numbers in the zip code column may appear only once, a storelocation terminating (routing) number is not limited in the number ofzip codes with which it may be associated. Further, due to how the tableis searched by the service logic, i.e., 9 digit zip codes are searchedthen 8 digit, etc., it should be noted that 63101-1234 and 63101-123would not cover the same zip codes. That is, 63101-1234 only covers63101-1234, while 63101-123 covers all zip codes beginning with63101-123 except 63101-1234 (and any additional 9 digit zip codes withinthe predefined table with a 63101-123 root).

The initial service information may be input into the ISCP via acomputer workstation interface by a service representative of theservice provider. The data may be uploaded or transferred to the ISCP.For example, a SPACE workstation interface (available from Bellcore) maybe used to interface and transfer information to the ISCP. Thesubscriber may provide the service representative with the zip codes toroute telephone numbers in a predefined service table stored in a fileformat on magnetic (or floppy) disk, e.g., ASCII, DOS using Excel orLotus 1-2-3 spreadsheets, etc. Each subscriber table may contain aplurality of records, each record including two fields, i.e., a 5 to 9digit zip code and an associated 10 digit routing telephone number (see,e.g., FIG. 3). The fields within a subscriber table may be separated bya tab and each record may be separated by returns.

As predefined in the example of FIG. 3, a telephone call originatingfrom location A, (in zip code 63101-1234 of FIG. 2), will be directed totelephone number (314)380-8500 or Business X main location 36B. A calloriginating from location B (in zip code 63101-1301) will be routed totelephone number (314)380-8502 or branch office 3 at location 46B. Acall originating at location C (in zip code 63101-2004) will be routedto telephone number (314)364-4677 or branch office 2 at location 40B.However, a call from location D (zip code 63101-1235) cannot be routedthrough the predefined table of FIG. 3. Accordingly, a call originatingfrom this location must be forwarded to a default number or to arecording (e.g., "We are sorry, but the company you are calling does notcurrently serve your area with this telephone number. Please call orvisit one of their convenient locations listed in your local telephonedirectory. Thank you for calling."). If location D is within the desiredservice area of the subscriber, the predefined table of FIG. 3 should berevised so that a routing number is defined for call originating withinthat zip code+4 service area.

The single telephone number zip code routing service, i.e., "simple"single telephone number zip code routing service, may also be combinedwith other features, e.g., day of the week/time of day routing; specificdate routing; and percent allocation routing, to provide more "complex"routing services. For example, the single telephone number zip coderouting service of the present application may be combined with one ormore of the AIN routing services as disclosed in commonly owned U.S.application Ser. No. 08/455,024, filed May 31, 1995, entitled "Apparatusand Method for Forwarding Incoming Calls", the disclosure of which isincorporated herein by reference in its entirety.

In general, the AIN trigger may be established in the SSP end officethat serves the NXX of the subscriber's single telephone number. Thesingle telephone number may arrive at the SSP end office by normalnetwork translations, i.e., the call may be directed to the callednumber serviced by the SSP end office. Once the offered call reaches theSSP end office, the single telephone number call may actuate the AINtrigger, which will suspend call processing while the SSP end officequeries the ISCP to determine which appropriate branch office to routethe offered call. The SSP end office may then route the offered call toa location as directed by the ISCP response message.

1. Trigger Requirements

The single telephone number zip code routing service of the presentinvention preferably employs a terminating trigger strategy in which thetrigger may be provisioned within the end office of the NXX of thesingle telephone number. This preferred strategy simplifies the overallservice because the ISCP logic for the single telephone number routingservice may be limited to the trigger type and AIN Release number of theend office serving the NXX of the single telephone number and becauseany impact on switching memory, due to announcements or digit collectionfunctionality implementation, may occur only on the end office servingthe NXX of the single telephone number.

As indicated above, the present invention may be implemented with: 5ESS,1AESS, and/or DMS-100 switches. The trigger on the 5ESS switch is a 10Digit Trigger. The trigger may be based upon AIN Release 0.1 protocoland may preferably require that AIN Release 0.1 query call variables beconverted into common call variables by a CPR in the ISCP 30. If the5ESS switch is utilized, then these switches should be equipped withGeneric 5E9(1) (or higher) and provided the necessary triggerrequirements in order to serve subscribers. The trigger on the 1AESSswitch may be a dialed line number (DN) trigger based upon a 10 digitvirtual number. The trigger may be based upon the AIN Release 0.0protocol and may preferably require AIN Release 0.0 query call variablesto be converted into common call variables by a CPR in the ISCP 30.Further, if 1AESS switches are employed, they should preferably beequipped with Generic 1AE12.03 (or higher) and provided the necessarytrigger requirements in order to serve subscribers. The trigger of theDMS-100 switch may utilize a termination attempt trigger (TAT) basedupon the AIN Release 0.1 protocol and may preferably require AIN Release0.1 query call variables to be converted into common call variables by aCPR in the ISCP 30. Further, if DMS-100 switches are used, NA003,Release 2 (or higher) should preferably be provided.

A DN trigger is one of several triggers in the originating call model.The 1AESS DN trigger has the same characteristics of the 5ESS 3/6/10digit trigger. Calls routed by such an SSP may suspend processing aftercompleting digit analysis and query the ISCP for further instructions.Like the 3/6/10 digit trigger, the DN trigger may be provisioned torecognize either NPA, NPA-NXX, or NPA-NXX-XXXX. For the single telephonenumber routing service, the ten digit trigger is preferably employed.

The TAT may be the only trigger detected in the terminating call model.This trigger may be detected in the null state of the terminating callmodel at the point when it has been determined that a connection betweensome originating facility is to be made to the DN to which thetermination attempt trigger is assigned. When an SSP encounters a TAT, aterminating attempt query is launched prior to choosing the specificport to seize and the call is routed via instructions from the ISCP. Itis noted that only analog lines can be provisioned as TATs and that thetermination attempt trigger may be the only true terminating triggerdefined within AIN Release 0.1.

According to an aspect of the present invention, the single telephonenumber that triggers AIN processing may be a virtual number, i.e., thesingle telephone number is not a routing number option. Whileprovisioning the service in this manner may technically be possible withthe TAT trigger on the DMS-100, the 3/6/10 trigger of the 5ESS, and theDN trigger on the 1AESS, calls intended for termination at the routingnumber may not be terminated as desired. That is, a call intended forthe routing number would preferably always trigger the AIN service and,therefore, be redirected to the nearest office to the caller. Use of avirtual single telephone number enables customers to dial a specificoffice of the subscriber directly, if necessary.

The virtual single telephone number is not preferred as the defaultrouting number. This is because, at some time it may be necessary ordesired for the subscriber to change the default routing number. Ifchanged, the single telephone number would most likely have to change,thus severely damaging advertising and goodwill expended by thesubscriber in promoting their single telephone number to the public.

Because the trigger is located within the SSP end office of the NXX ofthe virtual single telephone number, there are no specific requirementsfor access by a caller to the single telephone number. The singletelephone number may be accessed by any caller on any switch simply bydialing. In fact, any dialable telephone number on a 1AESS, 5ESS, orDMS-100 switch can be used as the single telephone number, althoughunderlying physical facilities may have to be changed or eliminated.

a. 5ESS Procedures

The 3/6/10 digit trigger may be provisioned on the 5ESS for the singletelephone number routing service. There is no limit on the number ofsimultaneous re-routed calls with the 3/6/10 digit trigger responsemessage. The 5ESS response timer for a query to the ISCP may need to beincreased from 3 to 4 seconds, depending on benchmarking of the SS7 LIDBget data query. The time-out limit applies only to the SSP where thesingle telephone number trigger is provisioned. The SSP timer includesthe time interval for the ISCP single telephone number call processingrecord (CPR) execution and ISCP get data query to the zip code LIDB DB,which may be, e.g., 0.6 seconds for a LIDB SCP get data query.

Some callers, e.g., those with four party service, coin telephones,etc., may not be able to access single number service.

However, a 5ESS switch based call forwarding response message to aterminating attempt trigger may include intraand inter-forwardinglimits, thus, limiting the number of simultaneously forwarded calls fromthe same TAT DN. The upper limit of the number of calls forwarded for a5ESS is 99. Because it is likely that larger subscribers may have wellover 100 simultaneously forwarded calls at any given time (especiallyduring normal business hours), the TAT of the 5ESS may not be employedfor the single telephone number service.

b. DMS-100 Procedures

The TAT trigger may be provisioned on the DMS-100 for single telephonenumber routing service. The DMS response timer for a query to the ISCPmay need to be increased from 3 to 4 seconds, depending uponbenchmarking of the SS7 LIDB get data query. This time-out limit appliesonly to the SSP where the single telephone number trigger isprovisioned. The SSP timer includes the time interval for the ISCPsingle telephone number routing service CPR execution and ISCP get dataquery to the zip code LIDB DB, which may be, e.g., 0.6 seconds for aLIDB SCP get data query.

Lines and trunks able to originate calls to any AIN 0.1 trigger(including TAT) include: public lines--single party flat rate, singleparty measured rate, PBX line flat rate, PBX line measured rate; privatelines--integrated business network, e.g., CENTREX, electronic businessset; public trunks--intertoll trunks, trunk incoming, trunk 2 way; andprivate trunks--trunk incoming, trunk 2 way, and primary rate interface.The lines and trunks must be supported in NA003, Release 2. Unsupportedlines may not originate calls to an AIN trigger for intraoffice calls,i.e., lines terminating in the SSP where the AIN trigger is provisioned.However, for example, a DMS two-party flat rate line may make calls to atriggered number in another office by supported trunk types.

The DMS-100 terminating attempt trigger forward call response messagedoes not have intra- or inter-forward limits. However, if a limit isplaced on the number of simultaneously forwarded calls, an option on theDMS-100 is to set a maximum of simultaneous forwarded calls to 1024,which should be sufficient for even large subscribers.

c. 1AESS Procedures

The DN trigger may be provisioned on the 1AESS for single telephonenumber routing. The DN trigger response message has no limit on thenumber of simultaneous re-routed calls. The 1AESS response timer for aquery to the ISCP may need to be increased from 3 to 4 seconds,depending upon Bellcore's benchmarking of the SS7 LIDB get data query.The 1AESS response timer in V12.03 (ASP3), which may be tunable by anoffice option record. The time-out applies only to the SSP where thesingle telephone number trigger is provisioned. The SSP timer includesthe time interval for ISCP single telephone number routing CPR executionand ISCP get data query to the zip code LIDB DB, which may be, e.g., 0.6seconds for a LIDB SCP get data query.

DN triggers may not be encountered on incoming calls received by Type 1or Type 2 trunk groups. These trunk groups are preferably converted,e.g., during SS7/AIN conversion, to Type 10 or Type 15 in order toreceive DN trigger treatment.

2. "Simple" Single Telephone Number Zip Code Routing

The "simple" single telephone number zip code routing service (i.e.,routing based only on geographic location) may include templated servicelogic to perform the zip code routing functionality. Because thequery/response for each SSP trigger to ISCP is different andquery/response for each ISCP-to-zip code+4 is identical, it is preferredto employ four CPRs within the ISCP for accomplishing the singletelephone number zip code routing service. That is, the templatedservice includes three trigger CPRs (one trigger CPR for each of theDMS-100, the 1AESS, and the 5ESS) and one zip code CPR for translatingthe CPN to the zip code+4 of the caller. Of course, the number of CPRsused may vary depending on the number of different types of SSP equippedswitches employed.

While each of the trigger CPRs may be different, the logical steps maybe the same. That is, the differences, e.g., AIN Release 0.1 or 0.0response call variables, are dependent upon the inherent differences ineach particular trigger, as discussed above.

The single telephone number routing service, both the "simple" and"complex" versions, employs a universal zip code CPR for translating theoriginating caller's CPN into the caller's zip code+4. The zip code CPR,receiving handover control from the trigger CPR (discussed below), maybe of template design. However, certain subscriber options, e.g. marketarea screening, may be available even though the service logic of thesimple single telephone number zip code routing service is designed astemplated service logic. Market area screening enables the subscriber toscreen areas of the local service from service access, e.g., if nooffices are nearby, etc. Market area screening may also be desirablebecause if the subscriber is responsible for billing after theoriginating call triggers the SSP, the subscriber can limit theoccurrence of toll call forwardings. According to an aspect of theinvention, the single telephone number zip code routing service may alsoinclude service logic to create records and reports regarding serviceoperation. To aid in the determination and/or correction of variouserrors or service problems, the single telephone number zip code routingservice may identify and classify errors by cause.

An exemplary flow diagram of the zip code CPR, which resides within theISCP and performs the translation of originating telephone number to thecaller's zip code+4, is shown in FIG. 5. At step 300, a query messagetransmitting the common call variables from the triggered SSP to theISCP is received. The SCP, at step 302, determines whether the customerphone number (CPN) of the calling party has been received. If no CPN hasbeen received, then the logic proceeds to step 301 to report data to theDRS that an error has occurred, i.e, the CPN was not received, and thenproceeds to step 303 to send a response to the trigger CPR to route tothe default number. The CPN will generally not be delivered from non-SS7offices, non-participating independent telephone companies, cellularcalls, etc. However, it is noted that cellular SS7 conversion may makeit possible for the CPN of a cellular telephone to be passed to theISCP.

If the CPN has been received, the logic determines, in step 304, whetherthe market area screening option has been subscribed to. If there is nomarket screening option, the logic proceeds to step 308. If there is amarket screening option, then the logic flow of the CPR proceeds to step306, and it is determined whether the caller's NPA-NXX is within thesubscriber's defined service area by accessing the table shown in FIG.4. FIG. 4 is a look-up table that defines the subscriber's market areain terms of NPA-NXXs. The look-up table may be stored in a databaseaccessible by the SCP and may be employed to determine whether thecaller's NPA-NXX is within the subscriber's defined market area. If thecaller's NPA-NXX was not within the subscriber's service area, an errormessage that the call is from outside of the subscriber's service areamay be reported to the DRS in step 305 and an response to play anannouncement is forwarded to the trigger CPR at step 307. Theannouncement may inform the caller that the call is not within thespecified service area of the subscriber, e.g., "We are sorry but thecompany you are calling does not currently serve your area with thistelephone number. Please call or visit one of their convenient locationslisted in your local telephone directory. Thank you for calling." If thecaller's NPA-NXX is within the defined market area of the subscriber,the logic proceeds to step 308.

At step 308, the ISCP determines whether the caller's NPA-NXX belongs toeither the service provider or a participating independent localexchange carrier (ILEC). To analyze the NPA-NXX, the SCP may access anNPA-NXX table, for example, as shown in FIG. 6. The NPA-NXX table may bestored in a database accessible by the SCP and may be employed todetermine whether the caller's NPA-NXX may be supported by the externalzip code database of the service provider or a participating ILEC. Thisscreening is performed to ensure that the query is not lost or rejectedby the SS7 network, the service provider, or an ILEC (whetherparticipating or not). The company identification codes may be unique tothe single telephone number routing service and may be placed in thetable for performance measurements. The service provider may beindicated, e.g., as "0". Company identification codes, i.e., theparticipating ILECs may be designated as, e.g., 100, 200, etc., and maybe supported by the performance measurement service logic. Thus, thepre-screening keeps performance results from being distorted for nothaving zip codes for a CPN which the service provider cannot get.

If the NPA-NXX is not listed in the NPA-NXX table, step 301 reports anerror message that the call is a non-service provisioner originated callto DRS and a response is sent to the triggering CPR to connect the callto the default number at step 303. If the NPA-NXX is listed, the logicproceeds to step 310 to get the caller's zip code from, e.g., anexternal zip code database.

The caller's CPN may be matched with entries in a database external tothe ISCP. For example, the CPN may be transmitted via an SS7 query toconvert the CPN to the caller's zip code+4. Alternatively, the query maybe directly transmitted over a TCP/IP network from the ISCP 30. Thetransmission over SS7 may be, e.g., a GetData command to the externalzip code database. The external database may be maintained by theservice provider or one of the ILECs. For example, if the NPA-NXX tableshowed a company identification of "0", the GetData query would betransmitted to a service provider database; if the companyidentification "100" was found in the NPA-NXX table, the query would betransmitted to a database maintained by the company identified a "100".The query is received by the external database and the CPN is comparedto a list of telephone customer telephone numbers (working telephonenumbers). Each listed telephone number has a zip code+4 associated withit, and the associated zip code +4 may be sent back to the ISCP via theSS7. Information and details on GetData parameters may be found inBellcore Document GR-2838-CORE (Generic Requirements for GetData), Issue1, August 1994 and in Section 13.6 (LIDB Interface/GetData Interface)thereof for error response messages; the disclosure of this Bellcoredocument is expressly incorporated herein by reference in its entirety.

The interface between the ISCP and external zip code database may beover SS7 or TCP/IP. Further, it is preferred that the external databasebe maintained as a redundant mated pair. Thus, the ISCP may query eitherof the redundant mated pairs of databases if GTT routing is supported,e.g., ISCP software Version 4.0 or may query only one LIDB inpoint-to-point routing if GTT routing is not supported, e.g., ISCPsoftware Version 4.0. GTT routing is preferred because it will allowISCP querying to either database in the event one of the pair fails.

The external CPN-to-zip code database may be created and maintained bythe service provider for all single telephone number zip code routingservice subscribers. The CPN and its associated zip code is corporatedata, not customer specific data, and, therefore, may also be accessedby other services needing a CPN-to-zip code conversion. The externaldatabase may be considered a network element as it is involved in callprocessing. The Line Information Data Base (LIDB) may be used to storethe CPN and associated zip codes. The LIDB may concurrently store theservice provider's working telephone numbers (WTN) and the zip codesassociated with each WTN may be added to the LIDB. CPN-to-zip codedatabases for participating independent companies, i.e., non-serviceproviders, should be maintained by those companies.

The CPN and associated customer address, which may be used to generate azip code, may be derived from the service provider billing database. Avalidating system, e.g., a billing validation distribution system(BVDS), may read a Customer Record Information Service (CRIS) unloadfile to determine the address associated with each CPN. The zip codeassociated with the CPN may be based on the service address, and may bedetermined by the presence of various address fields which are part ofthe service provider's general billing information, e.g., differentpremise address (DPA), service listed address (SLA), service address(SA), and listed address (LA). Once the service address has beendetermined, the validating system will assign a zip code+4 designationto an administrative system, e.g., a line validation administrationsystem (LVAS). The LVAS and GetData Interface are two possible directinterfaces into the CPN-to-zip code database.

The LVAS is generally an administrative system. The LVAS may include amirror image of LIDB and may perform continuous audits to ensureinformational synchronization with LIDB and CRIS. The LVAS may provideaccess to the LIDB through daily batch updates to add and delete CPNsand associated zip codes, although it may be necessary to modify theLVAS to accept 9 digit zip codes from the BVDS. The LVAS may use astored program to assign zip code+4 to the WTN, e.g., FINALIST. Inaddition to adding and/or updating customer WTNs, it may be necessary toupdate the zip code+4 information. Periodically the U.S. Postal Servicemay modify the zip code information, which must be updated in the LIDBas discussed above. Thus, the entire CPN-to-zip code+4 database shouldbe updated periodically, e.g., twice a year, by rerunning the zip code+4logic, discussed above. An on-line LVAS may provide direct access toupdate CPNs and associated zip codes as needed. The GetData interface isa service independent LIDB query that may request specific data elementsfrom a record in LIDB. GetData comprises an identifier to signify aGetData query, a service key to indicate the line record within LIDB forthe information sought, and a set of LIDB data elements identified byunique TCAP data element identifiers about data that the ISCP wants toreceive. Based upon the information in the GetData query, the CPN may betransmitted as a service key to obtain the line record information,i.e., zip code+4, associated with the CPN.

The LIDB may be used to store the zip codes associated with eachtelephone number because it generally contains all of the workingtelephone numbers in the service provider's service area and may includeWTNs of contracted local independent local exchange carriers. It may benecessary to update the data base to include 9 digit zip codes for eachassociated WTN. The LIDB requires preferably at least Version 7.0 forthe interfacing with the GetData command over the SS7. Further, Version7.0 reorganizes the LIDB to include tag-value fields whose contents aredefined by the client company.

In general, WTNs of the ILECs will not be contained within the serviceprovider's LIDB because the service provider generally does not haveaccess to information such as a customer's address. Thus, without thecustomer's address, the zip code cannot be determined. Accordingly, adefault 9 digit zip code, e.g. 00000-0000, may be stored in the LIDB tosend a zip code back to the ISCP even when the CPN originates from acaller of an ILEC. The same default 9 digit zip code may be used in theevent that a service provider's customer's zip code cannot be found orassigned.

Referring again to FIG. 5, at step 312 the logic waits a predeterminedtime (e.g., between 1.0 and 3.0 seconds, at least in half secondintervals) for the CPN-to-zip code translation to take place, beforeproceeding to step 314 to determine whether the GetData query wassuccessful. That is, when the GetData query is launched, the SCP maybegin a query timer to monitor the response time of the queryto/response from the external database. A query time-out may be set(e.g., at 1.5 seconds) although an average query/response generallytakes approximately 0.6 seconds. A second timer may be employed as asampling timer to ensure that a specified amount of time has elapsedbefore checking the time-out timer, e.g., every 1.0 seconds. The secondtimer may work in whole second intervals.

If a query is found unsuccessful, e.g., time-out, query error, at step311 the logic reports an applicable error message, i.e., a time-outcondition, signaling connection control part (SCCP), or LIDB processingerror, to the DRS. Time-out conditions may include: no response receivedand error notification received during the time-out interval. The queryerrors may include: routing error notification, e.g., signalingconnection control part (SCCP) (the query did not make it to the LIDB),generally caused by global title translation failures, unequipped users,and network problems, and LIDB processing error notification, i.e.,return of a return error message. After reporting the error, the logicat step 303 sends a response to the triggering CPR to route to thedefault number.

If the query is found successful at step 314, then step 316 the logicdetermines whether the CPN was listed in the external zip code database.If the CPN is not listed, the logic at step 313 reports to the DRS thatthe CPN was not in the LIDB and a response is then sent to the triggerCPR, at step 315, to route to the default number. If the CPN is listed,then at step 318, the logic determines whether the zip code+4 of the CPNwas in the external zip code data base. If the zip code is not located,then at step 313 the logic reports to the DRS that the CPN is in theLIDB but not the zip code+4 and at step 315, a response message is sentto the trigger CPR to route to the default number.

If the zip code+4 is located, then at step 320, the zip code+4 iscompared with the subscriber's predefined service area table todetermine whether a routing number is found. If a routing number isfound at step 322, then the logic proceeds to step 340. If, however, norouting number is ascertained, then the zip code+3 is compared, at step324, with the subscriber's predefined service area table to determinewhether a routing number is found in step 326. If a routing number isfound at step 326, the logic proceeds to step 340. However, if norouting number is ascertained, then the zip code+2 is compared, at step328, with the subscriber's predefined service area table to determinewhether a routing number is found at step 330. If a routing number isfound at step 330, the logic proceeds to step 340. When no routingnumber is ascertained at step 330, the zip code+1 is compared, at step332, with the subscriber's predefined service area to determine whethera routing number is found at step 334. If a routing number is found atstep 334, the logic proceeds to step 340. If no routing number isascertained, then the zip code is compared, at step 336, with thesubscriber's predefined service area to determine whether a routingnumber is found at step 338, as shown in FIG. 5.

The zip code information in the subscriber's predefined service areatable may be fully compressed to conserve the ISCP's memory capacity.Because these zip codes are fully compressed, the single telephonenumber zip code routing service zip code processing CPR may need toperform 1 to 5 table look-ups to find a matching compressed zip code,i.e., a table look-up for each of zip code+4; zip code+3; etc.Accordingly, to optimize the table look-ups, the predefined service areatable queries may be restricted to a minimum or maximum length zip code,e.g., predefined area and look-up search field restricted to zip code+2.This would eliminate unnecessary zip code look-ups and save processingtime by the ISCP.

If no routing number is found that corresponds with the subscriber'spredefined service area, the logic at step 319 reports that the zip codeis not within the predefined service area to the DRS and, at step 321,sends a response message to the trigger CPR to route to the defaultnumber. If a routing number is found that corresponds with thesubscriber's predefined service area table, the logic at step 340reports to the DRS that the call was routed to the subscriber's locationand, at step 342, sends a response message to the trigger CPR of thetriggering SSP to route the offered call to the routing number.

An exemplary flow diagram of the trigger CPR is shown in FIG. 7. Thetrigger CPR may reside in the SCP of the ISCP. In step 700, the SSP istriggered by the single telephone number, and depending on the type ofswitch that is equipped as the SSP, the appropriate trigger CPR isaccessed by the query launched by the SSP. In step 702, the AIN Release0.0 or 0.1 query call variables are converted to common call variablesby the trigger CPR logic for use by the ISCP. In step 704, the triggerCPR handsover control to the zip code CPR to determine the caller's zipcode+4. When control is returned to the trigger CPR at step 706, therouting number is also transferred. The routing number may be one of thesubscriber's satellite office closest to the caller's location or thesubscriber's default telephone number.

The trigger CPR may determine whether the routing number is inter- orintra-LATA at step 708 by using a LATA table, such as that shown in FIG.8. This table may maintained within the ISCP and may contain every NPA,NXX, and LATA for the service provider's service territory. The tablemay be created from a monthly file, e.g., terminating point master (TPM)generated by Bellcore. The LATA table may be used by the ISCP todetermine whether the routing telephone number returned from the zipcode CPR requires inter- or intra-LATA service, e.g., by comparing theLATA of the single number to the LATA of the routing telephone number.If the routing number requires inter-LATA routing, the inter-LATAcarrier may be set at step 710, e.g., standard POTS procedures forgenerating interexchange carriers (IXC) originating access. If therouting number requires intra-LATA routing, a local exchange carrier(LEC) must be set as the call carrier at step 709. Since the subscriberto the single telephone number service will pay for the forwarding legof the call, the subscriber must designate a carrier identification code(CIC) to be used in these cases. For example, the ISCP instructs the SSPto use a CIC of the single telephone number zip code routing subscriber,not the CIC of the originating number. At step 712, certain billinginformation may be set. According to an aspect of the invention, theoriginating caller may only be charged for the call origination to thetriggering SSP. For charges accruing due to triggering the SSP and anysubsequent routing, the charges may preferably be borne by thesubscriber. At step 714, the routing number and any other necessaryrouting information are transferred to the triggering SSP through theISCP response message over the SS7 or TCP/IP network.

Thus, according to general AIN principles and procedures, the routingnumber is passed to the triggering SSP. Call processing then resumeswith the suspended call being connected to the routing number fortermination.

As discussed above with respect to the zip code CPR, several possibleerrors may occur while the call is suspended and the triggering SSP isawaiting a response from the ISCP. These errors may be expected errorsof the operating system of the ISCP and are indicative of both serviceand subscriber performance. Further, additional indications may be madeif an error occurs due to a feature controlled and/or maintained by aparticipating ILEC. Thus, these errors may be quantified by, e.g., time,type, etc. and presented in a report for subscribers, customer servicepersonnel, and participating ILECs.

By noting the type and/or time of a specified error, e.g., CPN not inLIDB, zip code not in LIDB, query error, etc., customer servicepersonnel of the service provider may take corrective steps to avoid theerror in the future. By monitoring whether certain queries directed toparticipating ILEC facilities are being received, properly processed,and/or responded to, the service provider can monitor the efficiency ofthe ILEC so as to better serve the subscriber.

Other error information, e.g., that a specified zip code was not foundin the subscriber's predefined service area table, may be compiled andforwarded to the subscriber so that corrective action may be taken, suchas adding certain zip codes to the predefined service area table.Further, all reports may be of interest to the subscriber so that anassessment may be made of the success of the single telephone numberrouting service campaign and of the quality of service furnished by theservice provider.

As noted, the errors may be detected and recorded by the ISCP. Theinformation detected and recorded may be forwarded to a service providerlocation for processing and compilation in a manner similar to the datatransfer disclosed in commonly owned U.S. patent application Ser. No.08/473,919, filed Jun. 7, 1995, entitled "Apparatus and Method forRecording Call Related Data", the disclosure of which is incorporatedherein by reference.

To accomplish service monitoring, the ISCP platform 30 may provide withthe DRS with logic for selectively enabling a sampling node forcollecting call data on each query from the SSP and logic forselectively enabling a measurement node for measuring occurrences ofspecified events or paths taken in the service logic flow.

The zip code CPR, as mentioned above, forwards certain error data to theDRS for use in creating the error reports. When measurement or samplingnodes are active, all calls and call data will be tracked and stored onthe DRS. Daily data may be selected from the DRS, and scripts may beprovided to process and format the data and then transmit the data to adownstream processing database (not shown).

For example, customer performance reports may be generated. Thesereports may reflect a peg count of each error indication for eachsubscriber according to carrier, i.e., the service provider, ILEC, etc.Carrier service performance measurement reports may be generated. Thesereports may reflect a peg count for the service provider and eachidentified ILEC. Sampling data reports (according to CPNs not inexternal database or zip code not in external database) which may listthe CPN, the single telephone number, call date, call time, zip code+4,and error encountered. Sampling data reports (according to no zip codein subscriber's predefined table) which may list the CPN, singletelephone number, call date, call time, zip code+4, and errorencountered.

The measurement node may be created 100% of the time for all subscribersand for all predetermined error types. A toggle feature may beprogrammed into the zip code CPR to allow the measurement node to beturned off/on should the subscriber later wish to enable the same. Thesampling node may provide 100% call sampling of errors and also includea toggle feature.

The measurement and sampling data is an important sales tool because thesubscriber can see how efficiently the single telephone number routingservice is being maintained by the service provider. The supportingmeasurement data identifies whether the service provider or aparticipating ILEC is responsible for any necessary improvements. Thesampling data enables the service provider and the participating ILECsto improve their external zip code databases, and enable the subscriberto improve the predefined service area. The end result is better serviceto the subscriber's customers and to the subscriber.

3. "Complex" Single Telephone Number Routing

Because of the single telephone number routing service according to thepresent invention uses both a trigger CPR and a universal zip code CPR,the simple single telephone number routing service may allow for certainadded flexibility in service provisioning enabling additional customerdefined call forwarding options. That is, service provisioning may allowcertain defined exception periods to be "built-in" to the singletelephone number routing service such that the zip code routing may besuspended in favor of at least one of, e.g., time-of-day, day-of-week,specific date, and/or percent allocation, simply by modifying thetrigger CPR. These call forwarding methods may be implemented accordingto, e.g., the disclosure of commonly owned U.S. Application Ser. No.08/455,024, filed May 31, 1995, entitled "Apparatus and Method forForwarding Incoming Calls".

The trigger CPRs are stored and executed within the ISCP. This enablesthe trigger CPRs for the complex single number services, e.g., theexception periods, to take advantage of the internal ISCP clock fordetermining at least time-of-day, day-of-week, and the specific date ofreceiving the query from the SSP. When queries are launched to the ISCP,the ISCP notes the day, date and time, at least for billing purposes.The trigger CPRs for the complex single number service may also use thisinternal ISCP clock to determine whether a query is received during anexception period, the exception period defined within the trigger CPR,as more fully discussed hereinbelow.

Further, the exception periods may be defined before zip code routing,after zip code routing, or both. These services may be referred to assingle number service (routing) customer location routing service, andsingle number/customer location routing service, respectively.

a. Single Number Service

This complex service determines whether or not the subscriber desires toroute the call according to the caller's geographic location, i.e.,whether the trigger CPR should access the zip code CPR. FIG. 9 shows anexample of the trigger CPR for the single number service, according tothe present invention. Just as discussed above with respect to thesingle telephone number zip code routing service, each trigger mayrequire a different trigger CPR, which may be nonetheless logicallysimilar to each other.

This complex service defines exception periods and bypasses the zip codetranslation if the call originates during an exception period. Theseexception periods may be defined according to, e.g., date, time, day, orpercent allocation. These exception periods may be predetermined by thebusiness subscriber and stored in a database accessible by the ISCP.

Exception periods may be based upon a specific date. The subscriber mayselect, e.g., up to ten different dates per individual routing number,each date with a correspondingly defined routing telephone number. If acall is received on one of the exception period dates, the call may berouted according to a corresponding routing number or a percentallocation distribution. Calls received on non-exception period dateswill be routed according to the geographic location of the originatingcaller.

If the subscriber wishes an exception period based upon day or time, thesubscriber may define, e.g., a list or table of time-of-day/day-of-weekentries, each listing with a correspondingly defined routing telephonenumber. The list preferably accounts for each hour in a twenty-four hourperiod or each day of the week. The single telephone number routingservice subscriber may select, e.g., up to ten differenttime-of-day/day-of-week entries. If calls are received during anexception period, then zip code routing in not performed and the call isrouted according to the routing number in the time-of-day/day-of-weeklist or a percent allocation distribution. If calls are received duringa non-exception period, then zip code routing is performed.

Besides simply routing a call to a defined routing number during anexception period defined by one of date, time, and day, the subscribermay alternatively select percentage allocation routing. The subscribermay select, e.g., 2 to 5 percentages, preferably whole number andpreferably totalling 100%. The percent allocation feature does not limitthe subscriber to only one routing location during an exception period.Percent allocation allows subscribers to distribute calls among severalsatellite office during an exception period. The ISCP includes a randomallocation algorithm which may be implemented in providing the percentallocation feature.

An exemplary scenario of a single number service is shown in FIG. 10.The single number service, a complex service, is represented by 1000.The exception period 100% is, e.g., a day-of-week exception period inwhich on Saturday and Sunday the originating caller will be routed, at1004, to (314) 880-8500. Monday-Friday are not designated as exceptionperiods, thus, on those days, simple zip code routing 1002 of theoriginating call is performed.

An exemplary flow diagram of the trigger CPR is shown in FIG. 9. At step900, the SSP is triggered by the single telephone number, and dependingon the type of switch used as the triggering SSP, the appropriatetrigger CPR is accessed by the SCP from the query launched from the SSP.At step 902, the AIN Release 0.0 or 0.1 query call variables areconverted to common call variables by the trigger CPR for use by theISCP. At step 903, it is determined whether the current call has beenoffered during a defined exception period. Assume that the call isplaced during an exception period, e.g., Saturday. The trigger CPR willperform the defined call forwarding technique at step 905 and thenreturn routing number (314) 880-8500 to the trigger CPR at step 906.Assume that the call is placed during a non-exception period, e.g.,Tuesday. Control is handed over to the zip code CPR at step 904 forprocessing as discussed above in the single telephone number zip coderouting service. The remaining trigger CPR steps 708-714 are identicalto those discussed above.

It is noted that the selected manner of forwarding by the subscriber isnot limited to a single service. That is, any combination of theday-of-week, time-of-day, and specific date exception periods may becombined with a customer defined single number routing service.

b. Customer Location Routing

This service, like the single number service, determines whether or notthe subscriber desires to route the call according to the caller'sgeographic location or according to some other routing option. However,the customer location routing service determines whether to routeaccording to the caller's geographic location after the zip code+4translation has occurred. FIG. 11 shows an example of the trigger CPRfor the customer location routing service. Just as discussed above withrespect to the single telephone number zip code routing service, eachtrigger may require a different trigger, which may be nonethelesslogically similar to each other.

This complex service defines exception periods and determines whether acall routed to an individual subscriber's location requires additionalrouting. These exception periods may be defined according to, e.g.,date, time, or day.

Exception periods may be based upon a specific date that a call isrouted to a particular subscriber satellite location. For each singletelephone number routing service call, the CPN-to-zip code translationis performed, then the subscriber defined routing number is forwarded tothe trigger CPR. The single telephone number routing service subscribermay select, e.g., up to ten different dates per each routing number,each date with a correspondingly defined final routing telephone number.If a call is received on one of the exception period dates, the call maybe routed according to a corresponding final routing number or a percentallocation distribution. Calls received on non-exception period datesmay be routed according to the geographic location of the originatingcaller.

If the subscriber wishes an exception period based upon day or time, thesubscriber may define, e.g., a list of time-of-day/day-of-week entriesfor each subscriber satellite office, each listing with acorrespondingly defined routing telephone number. The list preferablyaccounts for each hour in a twenty-four hour period or each day of theweek. The single telephone number routing service subscriber may select,e.g., up to ten different time-of-day/day-of-week entries for eachsubscriber's office. If calls are received during an exception period,then the call is rerouted to the final routing number defined in thetime-of-day/day-of-week list or a percent allocation distribution. Ifcalls are received during a non-exception period, then routing to thesubscriber office telephone number determined during zip code routing isperformed.

Besides simply routing a call to a defined routing number during anexception period defined by one of date, time, and day, the subscribermay alternatively select percentage allocation routing. The subscribermay select, e.g., 2 to 5 percentages, preferably whole number andpreferably totalling 100%. The percent allocation feature does not limitthe subscriber to only one routing location during an exception period.Percent allocation allows subscribers to distribute calls among severalsatellite office during an exception period. The ISCP includes a randomallocation algorithm which may be implemented in providing the percentallocation feature.

The flow diagram of the customer location routing service, shown in FIG.11, may be the same as the single telephone number zip code routingservice until control and the routing number are handed over to thetrigger CPR with the routing telephone number at step 1106. As discussedabove, the routing number may be one of the subscriber's satelliteoffice closest to the caller's location and the subscriber's defaulttelephone number.

An exemplary scenario of a customer location routing service 1200 isshown in FIG. 12. After the zip code routing of the originating call hasoccurred at 1201, it is determined whether the originating call is beingrouted to a location during an exception period. Assuming that thepossible locations for zip code routing are location P 1202 and locationQ 1206, that location P includes a time-of-day exception period, andthat location Q includes a day-of-week exception period. Location P,between 7:00 pm and 8:00 am, will route all calls to an alternate (orfinal) routing number 1205, e.g., (314) 880-8500 and, between 8:01 amand 6:59 pm, will route all calls to the telephone number determinedduring simple zip code routing 1204. Location Q, on Saturday andWednesday, will route all calls to an alternate routing number 1208,e.g., (314) 880-8500 and, on Sunday-Tuesday, Thursday, and Friday, willroute all calls by simple zip code routing 1209.

After the zip code CPR hands over the routing number at step 1106, e.g.,the routing number for Location P, it is determined at step 1107 whetherthe current call has been offered during a defined exception period.Assuming that the originating call is placed during an exception period,e.g., 11:30 pm, the trigger CPR will perform the defined call forwardingtechnique, e.g., replace the zip code CPR routing number with the finalrouting number, at step 1111, and the logic forwards the routing numberto step 708. Assuming that the originating call is place during anon-exception period, e.g., 2:00 pm, the routing number the zip code CPRmay be forwarded by the logic at step 708. The remaining steps in thetrigger CPR are identical to those discussed above. Alternatively, ifthe routing number for Location Q was handed over from the zip coderouting at step 1106, it would be necessary to determine whether theoriginating call was placed during an exception period defined forLocation Q 1107, e.g., Saturday and Wednesday.

Once again, it is noted that the selected manner of forwarding by thesubscriber is not limited to a single service. That is, any combinationof the day-of-week, time-of-day, and specific date exception periods maybe combined with a customer defined customer location routing service.

c. Single Number/Customer Location Routing

This service, like other exception period services discussed above,determines whether or not the offered call should be routed solelyaccording to the caller's geographic location. This service is acombination of the single number service and the customer locationrouting. In other words, the zip code+4 translation may be bypassedduring certain defined exception periods and, during other definedexception periods, the closest location routing number may be replacedwith a final routing number. FIG. 13 shows an example of the trigger CPRfor the single number/customer location routing service. Again, eachtrigger may require a different trigger, which may be nonethelesslogically similar to each other.

For example, assume the scenario in FIG. 14. A single number service1400 time-of-day exception period 1401 is defined in which between 3:01pm and 2:59 am calls are allocated between satellite location R, S, andT at 35%, 45%, and 20%, respectively. Otherwise, calls are routedaccording to the zip code CPR routing number 1409. Further day-of-weekexception codes are defined for each satellite location R, S, T, U, andV at 1406, 1407, 1408, 1410, and 1417, respectively. Specifically,satellite location R 1411 has no exception logic on Monday throughFriday 1412, but is final routed to satellite location S on Saturday andSunday 1413; satellite location S has no exception logic on Saturday andSunday 1415, is alternate routed to satellite location T on Tuesdaythrough Friday 1420, and allocated 1416 on Monday between satellitelocation U (30%) 1418 and satellite location V (706) 1419; satellitelocation T has no exception on Monday through Friday 1422, and is finalrouted to satellite location S on Saturday and Sunday 1423; satellitelocation U has no exception on Monday, Wednesday and Friday 1425, isalternate routed to satellite location S on Saturday and Sunday 1426,and is alternate routed to satellite location V on Tuesday and Thursday1427; and satellite location V has no exception on Monday throughThursday 1429, is final routed to satellite location R on Friday 1430,and is final routed to satellite location S on Saturday and Sunday 1431.

In step 1300 of FIG. 13, the SSP is triggered by the single telephonenumber. At step 1302, the AIN Release 0.0 or 0.1 query call variablesare converted to common call variables for use by the ISCP. At step1303, it is determined whether the current call has been offered duringa defined exception period. If during an exception period, e.g., thecall is placed at 4:00 pm, the call will be percent allocated betweensatellite locations R, S, and T, and the routing number will beforwarded to the trigger CPR at step 708. If not during an exceptionperiod, e.g., the call is placed at 10:00 am, control is handed over tothe zip code CPR at step 1304 for processing as discussed above in thesingle telephone number zip code routing service.

After control and the routing number are handed over to the trigger CPR,at step 1306, the logic at, step 1307, determines whether the specificrouting number is within an exception period.

Assuming, e.g., that satellite location S was returned at step 1306 asthe closest satellite office of the subscriber and that it is Saturday,no exception period is recognized at step 1307 and satellite location Sis passed as the routing number at step 1308. Assuming, e.g., thatsatellite location S was returned to step 1306 on a Wednesday, step 1307recognizes the exception period and step 1311 determines that satellitelocation T should be returned as the routing number at step 708. Theremaining steps in the trigger CPR are identical to those discussedabove.

Thus, the subscriber may individually define and, therefore, fine tune aservice area to satisfy the various requirements of the patrons of itssatellite offices within an intended service area. As shown above, whenseveral satellite offices are within the same local telephone servicearea, the single telephone number service may be defined such thatcertain offices are not forwarded calls during times in which the officeis closed.

It is noted that the foregoing examples have been provided merely forthe purpose of explanation and are in no way to be construed as limitingof the present invention. While the invention has been described withreference to a preferred embodiment, it is understood that the wordswhich have been used herein are words of description and illustration,rather than words of limitations. Changes may be made, within thepurview of the appended claims, as presently stated and as amended,without departing from the scope and spirit of the invention in itsaspects. Although the invention has been described herein with referenceto particular means, materials and embodiments, the invention is notintended to be limited to the particulars disclosed herein; rather, theinvention extends to all functionally equivalent structures, methods anduses, such as are within the scope of the appended claims.

What is claimed is:
 1. A method for routing an originating call to asubscriber location within a local communication network, said networkcomprising a two-way communication network interconnecting a pluralityof service switching points and a plurality of dispersed networklocations, said service switching points selectively establishing acommunication connection between at least two of said network locationsin response to a local call request from a calling party initiated byinputting a telephone number, said network locations including aplurality of subscriber locations, and an integrated service controlpoint comprising a service control point comprising subscriber servicelogic, said method comprising:identifying a subscriber's service at aservice switching point serving the input telephone number based on thelocal call request from the calling party to establish a communicationconnection with the subscriber; ascertaining a geographic location ofthe calling party in accordance with the originating telephone number ofthe calling party; and determining, within the integrated servicecontrol point, which of the plurality of subscriber locations is closestto the geographic location of the calling party, the determiningincluding comparing the ascertained geographic location with apredefined list of geographic areas corresponding to post office zipcode+4 designations and comprising a predefined subscriber service area,each subscriber service area being associated with a routing telephonenumber corresponding to one of the plurality of subscriber locations,the comparing comprising comparing the ascertained geographic locationto the zip code+4 designation of each listed geographic area, wherein ifno matches are found comparing the ascertained geographic location tothe zip code+3 designation of each listed geographic area, wherein if nomatches are found, comparing the ascertained geographic location to thezip code+2 designation of each listed geographic area, wherein if nomatches are found, comparing the ascertained geographic location to thezip code+1 designation of each listed geographic area, wherein if nomatches are found, comparing the ascertained geographic location to thezip code+0 designation of each listed geographic area, and wherein if nomatches are found, the call request is forwarded to a predetermineddefault routing telephone number wherein, if a match is found the callrequest is forwarded to the associated routing telephone number.
 2. Themethod according to claim 1, the ascertaining step including:receivingthe originating telephone number; and translating the originatingtelephone number into a zip code of call origination.
 3. The methodaccording to claim 1, the ascertaining step including:forwarding theoriginating call to a predetermined default telephone number when theoriginating telephone number is not received by the service controlpoint.
 4. The method according to claim 1, further comprising limitingincoming calls to the identified service to calls originating within apredefined geographic area.
 5. The method according to claim 4, thelimiting step occurring after identifying the service and before theascertaining step.
 6. The method according to claim 4, the predefinedgeographic area defining a market area of the subscriber and stored in atable in the service control point.
 7. The method according to claim 4,forwarding calls originating outside of said predefined geographic areato an informational announcement.
 8. The method according to claim 1,wherein the predefined list correlates each geographic location withinthe subscriber services area with a predefined terminating number of oneof the plurality of subscriber locations.
 9. The method according toclaim 1, the ascertaining step comprising:querying a database externalto the integrated service control point that includes a list of serviceprovider customer telephone numbers and corresponding customergeographic information.
 10. The method according to claim 9, saidcustomer information including zip code+4 information.
 11. The methodaccording to claim 9, responding to the querying step by transmittingthe geographic information related to the originating telephone numberto the service control point.
 12. The method according to claim 11, thedetermining step forwarding the call request to a terminating telephonenumber of the closest subscriber location to the geographic locationresponse.
 13. The method according to claim 9, responding to thequerying step by transmitting predetermined default geographicinformation when the originating telephone number is not listed in theexternal database.
 14. The method according to claim 13, the determiningstep forwarding the call request to a predetermined default telephonenumber when predetermined default geographic information is transmittedin the query response.
 15. The method according to claim 9, saidascertaining step further comprising:waiting a predetermined time periodfor a response to the query to the external database; forwarding thecall request to a predetermined default routing telephone number if aresponse is not received within the predetermined period.
 16. The methodaccording to claim 15, said predetermined time period being betweenapproximately 1.0 and 3.0 seconds.
 17. The method according to claim 9,the external database comprising a line information database.
 18. Themethod according to claim 17, the line information databasecomprising:receiving service provider customer billing information foreach associated customer telephone number; stripping off post office zipcode+4 designations for each customer; and storing for each customer zipcode+4 designation according to the associated customer telephonenumber.
 19. The method according to claim 1, said method furthercomprising recognizing an exception period for providing at least onealternate routing telephone number.
 20. The method according to claim19, wherein when the exception period is recognized before theascertaining step, the method further comprising forwarding the callrequest to a one of the at least one alternate routing telephone number.21. The method according to claim 20, each of the at least one alternaterouting telephone number is assigned according to one of time of day,day of the week, specific date, andwherein each of the at least onealternate routing telephone number may be further forwarded according topercent allocation distribution.
 22. The method according to claim 19,the exception period comprising a plurality of exception periods, atleast one exception period being associated with at least one routingtelephone number associated with one of the plurality of subscriberlocations,wherein when one of the exception period is associated withthe determined closest subscriber location, the method furthercomprising: forwarding the call request to a one of the at least onealternate routing telephone numbers.
 23. The method according to claim22, each of the at least one alternate routing telephone number isassigned according to one of time of day, day of the week, specificdate, andwherein each of the at least one alternate routing telephonenumbers may be further forwarded according to percent allocationdistribution.
 24. The method according to claim 19, the exception periodcomprising a first and a second exception period,said first exceptionperiod being recognizable before the ascertaining step, wherein when thefirst exception period is recognized, the method further comprisingforwarding the call request to a one of the at least one alternaterouting telephone number; said second exception period comprising aplurality of exception periods, at least one exception period beingassociated with at least one routing telephone number associated withone of the plurality of subscriber locations, wherein when one of theexception period is associated with the determined closest subscriberlocation, the method further comprising:forwarding the call request to aone of the at least one alternate routing telephone numbers.
 25. Themethod according to claim 24, each of the at least one alternate routingtelephone number is assigned according to one of time of day, day of theweek, specific date, andwherein each of the at least one alternaterouting telephone number may be further forwarded according to percentallocation distribution.
 26. The method according to claim 1, thedetermining step including:predefining a certain percentage of incomingcalls to be allocated among each of a predetermined plurality of saidsubscriber locations; selecting, according to a volume of said incomingcalls and to said predefined percentages, one subscriber location ofsaid predetermined plurality of subscriber locations to which toallocate said call request; and identifying said one location as saiddetermined closest subscriber location.
 27. An apparatus for routing anoriginating call to a subscriber location within a local communicationnetwork, said network comprising a two-way communication networkinterconnecting a plurality of service switching points and a pluralityof dispersed network locations, said service switching pointsselectively establishing a communication connection between at least twoof said network locations in response to a local call request from acalling party initiated by inputting a telephone number, said networklocations including a plurality of subscriber locations, and anintegrated service control point comprising a service control pointcomprising subscriber service logic, said apparatus comprising:means foridentifying a subscriber's service at a service switching point servingthe input telephone number based on the local call request from thecalling party to establish a communication connection with thesubscriber; means for ascertaining a geographic location of the callingparty in accordance with the originating telephone number of the callingparty; a system that recognizes an exception period, which correspondsto at least one alternate routing telephone number, before theascertaining means ascertains the geographic location of the callingparty; a forwarding system that forwards the call request to one of theat least one alternate routing telephone number when the recognizingsystem recognizes the exception period; means for determining, withinthe integrated service control point, which of the plurality ofsubscriber locations is closest to the geographic location of thecalling party when outside the exception period; and means for routingthe originating call to the determined closest subscriber location via alocal exchange carrier when outside the exception period.
 28. Theapparatus according to claim 27, the ascertaining step including:meansfor receiving the originating telephone number; and means fortranslating the originating telephone number into a zip code of callorigination.
 29. The apparatus according to claim 27, the ascertainingmeans including:means for forwarding the originating call to apredetermined default telephone number when the originating telephonenumber is not received by the service control point.
 30. The apparatusaccording to claim 27, further comprising means for limiting incomingcalls to the identified service to calls originating within a predefinedgeographic area.
 31. The apparatus according to claim 30, the limitingmeans actuated after said service is identified and before saidascertaining means are actuated.
 32. The apparatus according to claim30, the predefined geographic area defining a market area of thesubscriber and stored in a table in the service control point.
 33. Theapparatus according to claim 30, means for forwarding calls originatingoutside of said predefined geographic area to an informationalannouncement.
 34. The apparatus according to claim 27, the determiningmeans including:means for comparing the ascertained geographic locationwith a predefined list of subscriber service areas, the predefined listbeing stored within the service control point.
 35. The apparatusaccording to claim 34, wherein the predefined list correlates eachgeographic location within the subscriber service area with a predefinedterminating number of one of the plurality of subscriber locations. 36.The apparatus according to claim 27, the ascertaining meanscomprising:means for querying a database external to the integratedservice control point that includes a list of service provider customertelephone numbers and corresponding customer geographic information. 37.The apparatus according to claim 36, said customer information includingzip code+4 information.
 38. The apparatus according to claim 36, furthercomprising means for responding to the querying step by transmitting thegeographic information related to the originating telephone number tothe service control point.
 39. The apparatus according to claim 38, thedetermining means forwarding the call request to a terminating telephonenumber of the closest subscriber location to the geographic locationresponse.
 40. The apparatus according to claim 36, further comprisingmeans for responding to the querying step by transmitting predetermineddefault geographic information when the originating telephone number isnot listed in the external database.
 41. The apparatus according toclaim 40, the determining means forwarding the call request to apredetermined default telephone number when predetermined defaultgeographic information is transmitted in the query response.
 42. Theapparatus according to claim 36, said ascertaining means furthercomprising:means for waiting a predetermined time period for a responseto the query to the external database; and means for forwarding the callrequest to a predetermined default routing telephone number if aresponse is not received within the predetermined period.
 43. Theapparatus according to claim 42, said predetermined time period beingbetween approximately 1.0 and 3.0 seconds.
 44. The apparatus accordingto claim 37, the predefined list including:a plurality of geographicareas which comprise a predefined subscriber service area, wherein eachgeographic area listed is associated with a routing telephone numbercorresponding to one of the plurality of subscriber locations.
 45. Theapparatus according to claim 44, the determining means comprising:meansfor comparing the ascertained geographic location with each geographicarea listed in the predefined list, wherein, if one of the plurality ofgeographic areas corresponds to the ascertained geographic location,forwarding the call request to the associated routing telephone number,and wherein, if one of the plurality of geographic areas does notcorrespond to the ascertained geographic location, forwarding the callrequest to a predetermined default routing telephone number.
 46. Theapparatus according to claim 45, wherein each geographic area is listedaccording to it post office zip code+4 designation, and said comparingmeans comprises:comparing the ascertained geographic location to the zipcode+4 designation of each listed geographic area, wherein if no matchesare found, comparing the ascertained geographic location to the zipcode+3 designation of each listed geographic area, wherein if no matchesare found, comparing the ascertained geographic location to the zipcode+2 designation of each listed geographic area, wherein if no matchesare found, comparing the ascertained geographic location to the zipcode+1 designation of each listed geographic area, wherein if no matchesare found, comparing the ascertained geographic location to the zipcode+0 designation of each listed geographic area, and wherein if nomatches are found, the call request is forwarded to a predetermineddefault routing telephone number.
 47. The apparatus according to claim36, the external database comprising a line information database. 48.The apparatus according to claim 47, the line information databasecomprising:means for receiving service provider customer billinginformation for each associated customer telephone number; means forstripping off post office zip code+4 designations for each customer; andmeans for storing for each customer zip code+4 designation according tothe associated customer telephone number.
 49. The apparatus according toclaim 27, each of the at least one alternate routing telephone number isassigned according to one of time of day, day of the week, specificdate, andwherein each of the at least one alternate routing telephonenumber may be further forwarded according to percent allocationdistribution.
 50. The apparatus according to claim 27, the exceptionperiod comprising a plurality of exception periods, at least oneexception period being associated with at least one routing telephonenumber associated with one of the plurality of subscriberlocations,wherein when one of the exception period is associated withthe determined closest subscriber location, the apparatus furthercomprising:means for forwarding the call request to a one of the atleast one alternate routing telephone numbers.
 51. The apparatusaccording to claim 50, each of the at least one alternate routingtelephone number is assigned according to one of time of day, day of theweek, specific date, andwherein each of the at least one alternaterouting telephone numbers may be further forwarded according to percentallocation distribution.
 52. The apparatus according to claim 27, theexception period comprising a first and a second exception period,saidfirst exception period being recognizable before the ascertaining step,wherein when the first exception period is recognized, the apparatusfurther comprising means for forwarding the call request to a one of theat least one alternate routing telephone number; said second exceptionperiod comprising a plurality of exception periods, at least oneexception period being associated with at least one routing telephonenumber associated with one of the plurality of subscriber locations,wherein when one of the exception period is associated with thedetermined closest subscriber location, the apparatus furthercomprising:means for forwarding the call request to a one of the atleast one alternate routing telephone numbers.
 53. The apparatusaccording to claim 52, each of the at least one alternate routingtelephone number is assigned according to one of time of day, day of theweek, specific date, andwherein each of the at least one alternaterouting telephone number may be further forwarded according to percentallocation distribution.
 54. The apparatus according to claim 27, thedetermining means including:means for predefining a certain percentageof incoming calls to be allocated among each of a predeterminedplurality of said subscriber locations; means for selecting, accordingto a volume of said incoming calls and to said predefined percentages,one subscriber location of said predetermined plurality of subscriberlocations to which to allocate said call request; and means foridentifying said one location as said determined closest subscriberlocation.
 55. A system for routing an originating call to a subscriberlocation within a local communication network, said network comprising atwo-way communication network interconnecting a plurality of serviceswitching points and a plurality of dispersed network locations, saidservice switching points selectively establishing a communicationconnection between at least two of said network locations in response toa local call request from a calling party initiated by inputting atelephone number, said network locations including a plurality ofsubscriber locations, and an integrated service control point comprisinga service control point comprising subscriber service logic, said systemcomprising:an identifying system that identifies a subscriber's serviceat a service switching point serving the input telephone number based onthe local call request from the calling party to establish acommunication connection with the subscriber; an ascertaining systemthat ascertains a geographic location of the calling party in accordancewith the originating telephone number of the calling party; adetermining system that determines, within the integrated servicecontrol point, which of the plurality of subscriber locations is closestto the geographic location of the calling party; and a routing systemthat routes the originating call to the determined closest subscriberlocation via a local exchange carrier; wherein the ascertaining systemcomprises a querying system for querying a line information database,external to the integrated service control point, that includes a listof service provider customer telephone numbers and correspondinggeographic information, the line information database comprising areceiver that receives service provider customer billing information foreach associated customer telephone number, a stripper that strips offpost office zip code+4 designations for each customer, and a storagethat stores each customer zip code+4 designation according to theassociated customer telephone number.
 56. The system according to claim55, said determining system including:a predefining system forpredefining a certain percentage of incoming calls to be allocated amongeach of a predetermined plurality of said subscriber locations; aselecting system for selecting, according to a volume of said incomingcalls and to said predefined percentages, one subscriber location ofsaid predetermined plurality of subscriber locations to which toallocate said call request; and an identifying system for identifyingsaid one location as said determined closest subscriber location.